The Columnist Manifesto

WS has this to say about yesterday's post re: "the Affront":

According to "The Songwriter's Guide to Collaboration" by Carter, Writer's
Digest Books, you and CT *both* own equal shares in this particular joke.
It would have been better if the 2 of you had worked out an agreement
beforehand (and even better to have it on paper). What the book recommends
is that "anyone in the room" when a song (or by extension, joke) is written
is a co-writer - and they give an example very much like your "out front"-
turns-into-Affront example.

I guess there was more to this thing than I thought.